UFC officials today announced that Daniel “Ninja” Roberts (12-3 MMA, 3-3 UFC) is injured and has been forced to withdraw from the preliminary card contest, and Mike Stumpf (8-2 MMA, 0-0 UFC) has been tapped as a replacement.

A Team Curran product, Stumpf is a nine-time veteran of the Xtreme Fighting Organization. Stumpf fought once under the ShoXC banner in an October 2008 loss to Anthony Lapsley.

Seven of Stumpf’s 11 career wins have come via submission.

Meanwhile, Waldburger recently saw a four-fight win streak snapped with a TKO loss to Johny Hendricks. The defeat came in Waldburger’s second UFC fight. His first was a rousing decision win over fellow grappler David Mitchell at UFC Fight Night 22 in September 2010.

Ten of Waldburger’s 13 career wins have come via submission.

A Cesar Gracie Jiu-Jitsu product, Roberts was likely in a must-win
situation in the planned contest. An octagon-debut loss was followed by
three impressive wins over Greg Soto, Michael Guymon and Forrest Petz,
but back-to-back decision losses to Rich Attonito and Claude Patrick
have left Roberts on thin ice in the UFC’s talent-rich 170-pound
division.

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